package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.Result;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在，只需要将数量加一
        if (list!=null&&list.size()>0){
            ShoppingCart cartServiceOne = list.get(0);
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartMapper.update(cartServiceOne);
        }
        //如果不存在需要加入一条购物车数据
        else {
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!=null){
                //本次添加到购物车的是菜品
                Dish dish=dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            else {
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal=setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                .userId(userId)
                .build();
        return shoppingCartMapper.list(shoppingCart);
    }

    @Override
    public Result cleanShoppingCart() {
        Long userId=BaseContext.getCurrentId();
        shoppingCartMapper.cleanShoppingCartByUserID(userId);
        return Result.success();
    }

    @Override
    public Result sub(ShoppingCartDTO shoppingCartDTO) {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(userId);
        //用list主要是可以不用设计其他接口，直接用list
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        ShoppingCart cartServiceOne = list.get(0);
        Integer number = cartServiceOne.getNumber();
        //判断是否为1，为1则删除
        if (number==1){
            shoppingCartMapper.deleteById(cartServiceOne.getId());
        }
        //否则减一
        else {
            cartServiceOne.setNumber(number-1);
            shoppingCartMapper.update(cartServiceOne);
        }
        return Result.success();
    }
}
